Our natural plant extracts are carefully selected and scrutinized so that we can guarantee exact percentage of the active molecules in our formulas for a specific and consistent efficiency of our productions.

Priority is always given to botanical and plant extracts over biotechnology as long as they can meet our expectations and conform to our commitment to quality and results and as long as they are available in a safe and consistent manner.

Each batch of essential oil entering in our production is submitted to testing in order to ensure its perfect condition, its quality and the active concentration of each particle that composes it. It results to the elimination of non-conform or fraudulent batches.

Such events are rare to us as we have been working for years with the best and most reliable producers. However, if such issues arise, it is most often related to the scarcity and high prices of the essential oils. Only very specific and precise analysis material can detect such frauds, hence the highly advanced controls of our Quality Control Department

All our products are formulated, manufactured, controlled and distributed by us so we can provide TOTAL TRACEABILITY of each item we produce, from the raw material so far as its final destination to the point of sell.

Before reaching the market and the consumers, each Yon-Ka reference is tested for safety as follows:

- In vitro tolerance tests following current and recognized alternative methods and with no animal testing

- In vivo tolerance test under the supervision of an investigating doctor.

The size of the volunteers’ panel, the duration and the type of tests will depend on the formula of the product, its claims and its recommendation for use. – to know more -

Used in various concentrations in 70% of our ranges, always pre-measured to ensure absolute safety and optimum results, Quintessence increases the effectiveness of the ingredients it is combined with and provides an olfactory experience that can be relaxing or energizing depending on what is needed.